<!DOCTYPE html>
<html>
<head>
<style>
textarea, div[contentEditable] {
    display: block;
    border: 1px solid;
    height: 5em;
    width: 100%;
}
</style>
</head>
<body>

Use Ctrl+V (or Cmd+V) to paste plain text here:
<textarea></textarea>

Use Ctrl+V (or Cmd+V) to paste rich text (HTML) here:
<div contentEditable></div>

</body>
</html>
